“Summer is exhausting me with its exhaust fumes and empty promises.” Jens Lekman’s new album is called I Know What Love Isn’t, and its first single “Erica America” is true to that title: meet Jens 2K12, an elegant and articulate bummed-out human. When Lekman showed showed up at Williamsburg’s McCarren Park for his Northside set two Saturdays ago, he had a shaved head under a baseball cap. This one-shot video for lead single “Erica America” has Lekman’s bald dome bared, with him in a depressed man’s cardigan (remember when he and the band were all blaring white outfits?), and in a drab building, broken up by some moments of warm lighting orchestrated by director Marcus Söderlund. Not a Song Of Summer candidate, unless you are a heartbroken person looking for a songwriter to feel your pain. If so, this video is particularly for you: